//创建一个新的类，让这个类继承标准库中的Thread
class MyThread extends Thread{
    @Override
    public void run(){
        while (true){
            System.out.println("hello thread");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
public class Demo1 {
    public static void main(String[] args) {
      Thread t=new MyThread();
     t.start();
      while (true){
          System.out.println("hello main");
          try {
              Thread.sleep(1000);
          } catch (InterruptedException e) {
              throw new RuntimeException(e);
          }
      }
    }
}
